Furnace-door



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T. R. BUTMAN.

v v l PURNAGE Doon. No. 308,551. Patented Nov. 25, 1884.

3 Sheets-Sheet 2.

(No Model.)

T. B BUTMAN.

FURNAGE DOOR. No. 308,551. Patented Nov. 25, 1884.

WITNESSES IJVVEJVII'OR @12A uw v J9@ ym 3 Sheets-Sheet 3.

(No Model.)

T.R.BUTMAN. FURNAGB DO0R.

Patented Nav, 25,1884,

WITNESSES UNrrE- SrArEs @PATENT Errore...

THOMAs EEED EUTMAN, OE oLEvELAND, Assioivon ro JAY A. HIGBEE, OE

Y EEEMONT, onto.

FURNACE-DOOR.

SPECIFICATION forming part of Letters Patent No. 308,551, dated November25, 1884. Application tiled March El, 1883. Renewed April 16, 1884. (Nomodel.)

T all whom t may concern.-

Be it known that I, THOMAS REED BUTMAN.y of Cleveland, in the county ofCuyahoga and State of Ohio, have invented certain new and usefulImprovements in Furnace-Doors5 and I do hereby declare that thefollowing is a full, clear, and exact description of the invention,which will enable others skilled in the art to which it appertains tomake and use the same,

io reference being had to the accompanying drawings, and to thel lettersof reference marked thereon, which form part of this specification.

My invention relates to new and useful improvements in furnace-doors,butparticularl y applicable to the furnaces of locomotives and marineboilers. It has for it object simplicity in construction, cheapness infirst cost, facility for rapid firing, easy manipulation, and apartially automatic action.

2o The present invention is an improvement upon an application forlocomotive furnacedoors filed by me August 5, 1882, Serial No. 68,557,in which are used springs and other mechanism not so well adapted tolocomotivefurnaces as the present invention.

To improve on this door and to prevent it from rattling and jarringwhile in operation are further objects of my invention; and to this endit consists, iirst, in providing the door 3o with two operating-cranks,one of which is designed to open the door and the other to nearlybalance the door in such manner as to make it work upon its trunnionswith the same ease as if it were centrally pivoted, in

combination with the operating mechanism;

second, in the particular construction and arrangement ofthe combinedbox-bracket and shield relatively to the door-frame and de-`fleeting-plate in such manner that it forms a 4o bracket-hinge, towhich the tongue-hinge of the deilectingplate is secured by means of apintl-e at one end and to a. lug formed upon the door-frame at the otherend, permitting the connect-ing-link of the door and detlector to passthrough it, and to protect it from the heat and rough usage; third, itfurther consists in the combination of the door-delector and itsconnecting-link with the connectingrod, lever,and foot-operatingmechanism; and,

5o finally, iu the peculiar arrangement of the door-latch and springrelatively to the inclined edge of the door in such manner that the dooris prevented from jarring while the engine is in motion, all of whichwill more fully hereinafter appear.

Referring to the drawings, Figure l represents a front elevation of mydoor, showing the operating-rod and the counterpoise-weight mounted uponrod F. Fig. 2 is a vertical longitudinal section of Fig. 1. Fig. 3 isa'side 6o view ofthe compression-latch. Fig. 4 is a sectional view ot'the foot-post with its iieXible block, also in section. Fig. 5 shows avertical section of the door on the opposite side. Fig. 6 shows aninverted plan view of the deleotor, 65 showing th-e tongue-hinge andstii'fening-piece detachably secured to the deflector,'and thebox-bracket and the top ofthe door, and also of door-brackets and hinge.Fig. 7 shows an t visoinetrical perspective view of my door-frame 7o anddoor and brackets, the strengthening or stiffening rim of the edge ofthe door, and the bulged ring for fitting around the flangedfurnace-doorway.

rlhe same letters denote like parts in all the figures, in which A isthe door-frame; B, the door. C is the air-register, and D D the crankswhich are cast upon the door, one of them extending upward and outwardand the other upward and inward, (see Fig. 7,) and So are provided withjournal-bearings a. a.

E is a vertical rod, attached at one end to crank D and journaled onbearing a, and at the other end tothe workinglever G. (See Fig. 2.) Rod`F is connected to crank D on bearing o', and simply extends through thefoot-board, by which it is maintained in position. This rod is providedwith a weight, b, and so poised that it nearly couuterbalances the doorB, but not sov much as to prevent the 9o door from automatically closingitself by gravity."

cshow's the end of the retaining or compression latch, and l the lug onthe door, which will be more fully described farther on. 5

H is the foot-post, provided with recess e, which serves the purpose ofa retaining device whenthe door is held in an open position. Thefoot-post H is cast hollow in its lower portion, in which a rod,f, ispivoted, roo and this rod j' is connected to lever G at one of its ends,which lever G is fulcrumed in the middle in bracket I, which issuspended from the foot-board of the cab. The bore of footpost II ismuch larger than the rod f, and thus permits the rod to oscillate as itnieves' up or down. The rod Eis connected to lever G by two check-nuts,g g. These nuts, as they are screwed up or down, give more or less swingto the door in opening it.

Ordinarily, when the door is upon a stationary furnace, it will stayclosed of its own gravity; but when used upon a locomotive there is atendency for the door to shake and jar, which is annoying to theattendant and wearing on the parts. To prevent this jarring noise, Iprovide a retaining or spring compression latch, (see Figs. 2 and 3,)which is so arranged as to constantly bear against a beveled boss on thelower edge of the door, not latching the door, but to hold it by meansof the spring against the door, and so retains it in position withoutjarring. This latch is of special and peculiar construction and of greatimportance, and I will specially describe its construction and operationas follows: The compression-latch is suspended from the bottom of thedoor-frame by lugs or other suitable means, and extends back under thedoorframe. This back part, h, is provided with a spring, t', which isfastened to the top of the latch-piece and adapted to bear against thebottom of the door-frame. The. tendency of the spring is to depress thelatch-bar in the rear and throw it up in the front in such manner as toconstantly bear against the door when closed. A set-screw, j, regulatesthe tension of the spring as may be desired.

The front end of the latch is provided with a goose-neck and head-likecurve and incline (see Fig. 3) in such way as that when the door closesit strikes the incline and depresses the latch, and, when closed,presses back against the door and retains it so by compression of thespring. The goose-head portion is thicker than the rib and neck, and hasalso a backward bevel, so that when the door is opened it readily slidesover this incline and swings open. This compression-latch is applicableto other purposes and other doors, and may be put up in packages forcommercial use in the trade.

I will now proceed to describe the box-shield bracket andbracket-tongue, in which K is the bracket, `and L the lug cast on theinside of the top of the door-frame, to which the boxbracket is secured.

M is the tongue-bracket and stiffening-piece for the deflector, which isdetachably secured thereto, so that when the deflector is burned a newone may readily be substituted.

The door-frame (sce Fig. 7) is cast in one piece, and with it the lugsor brackets which form trunnions upon which the door is hung, and, asbefore stated, the box-bracket lug is also cast to the door-frame.

The contour of the door-frame and door presents a neat and prettyappearance and adds largely to the tasteful appearance of thefurnace-front.

Referring again to Fig. 4, which shows the foot-post, it will beobserved that it is also cast with a hollow top for the reception of aiiexible piece or block, serrated upon its top for the purpose ofincreasing the traction of the shoe-sole of the fireman, and at the sametime preventing too much wear on it, as would be the case if theserrations were made of iron. These flexible blocks, which maypreferably be made of vulcanized rubber, are detachable, so that whenthey become smooth on the surface a new one can be substituted.

I am aware that furnace-doors have been made with horizontally-swingingdefiectors, so that the door and deflector will simultaneouslyswingupwardly, and therefore do not broadly claim such construction in thisapplication; but

What I do claim, and desire to secure by Letters Patent, is-

l. The combination, in furnace-doors, consisting of the swinging door,the deflectingplate, and the connecting-link with the boxbracket andwith the tongue-bracket detachably secured to the deflector, asdescribed.

2. The combination, in furnace-doors, consisting of the swinging door,the deiiectingplate, and connecting -link with the boxbracket and withthe detachable tonguebracket, said box-bracket being secured to theframe ofthe door by means of the lug andv to the deflector by means ofthe tongue-bracket, as set forth.

3. The combination, in a furnace-door, consisting of the door,deflecting-plate, and their intermediate mechanism, with the operatingconnecting-rod, lever, and foot-post, arranged and operating as setforth.

4. The combination, in furnace-doors, of the door and deflecting-plate,hinged horizontally, the box-bracket and the connectinglink, the rod E,lever G, and foot-post mechanism with the counterpoise-weight and rod F,operating together as set forth.

5. .The combination, in a furnace-door, of the door and deflector,box-bracket and connecting-link, and tongue-bracket with the rod E,lever G, and foot-operating mechanism, with the door spring-latch formaintaining the door in position by compression, as set forth.

6. The combination, in a furnace-door, of the door having thestiffening-rim, and the cranks D D, in combination with the 'doorframeprovided with brackets or lugs cast thereon, said cranks being providedwith journal-bearings and with the pintle-rod, as set forth.

7. The combination, with the furnace-door adapted to hang horizontally,and provided with a crank, of the connecting-rod, the lever, fulcrumedas described, with the foot mechanism, the tread of the foot-post havinga flexible serrated bearing, all being arranged and operating as and forthe purpose set forth.

In testimony that I claim the foregoing as my own I affix my signaturein presence of two witnesses.

W'itnesses: THOMAS REED I IYllrIAN.`

B. F. MoRsELL, EDWARD E. ELLIS.

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